/* ============================================================
   Multitopics — Filter page
   Aesthetic: minimal · technical · precise
   ============================================================ */

#multitopics-wrapper {
    --c-text:         #0d0d0d;
    --c-muted:        #737373;
    --c-subtle:       #b0b0b0;
    --c-border:       #e8e8e8;
    --c-surface:      #f5f5f5;
    --c-accent:       #0057ff;
    --c-pill-active:  #0d0d0d;
    --c-pill-text:    #fff;

    --f-sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', system-ui, sans-serif;
    --f-mono: 'Fira Code', 'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

    --r-pill: 999px;
    --r-img:  5px;

    font-family: var(--f-sans);
    -webkit-font-smoothing: antialiased;
    color: var(--c-text);
}

/* ── Filter bar ─────────────────────────────────────────────── */

.mt-filters {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 36px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--c-border);
}

.mt-filter-row {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    min-height: 28px;
}

.mt-filter-label {
    font-family: var(--f-mono);
    font-size: 9.5px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--c-subtle);
    width: 62px;
    flex-shrink: 0;
    padding-top: 1px;
}

/* pill buttons */
.mt-filter-row button {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 11px 4px;
    border-radius: var(--r-pill);
    border: 1px solid var(--c-border);
    background: transparent;
    font-family: var(--f-sans);
    font-size: 12px;
    font-weight: 500;
    color: var(--c-muted);
    cursor: pointer;
    transition: border-color 0.12s ease, color 0.12s ease, background 0.12s ease;
    line-height: 1.6;
    white-space: nowrap;
    -webkit-user-select: none;
    user-select: none;
    outline: none;
}

.mt-filter-row button:hover {
    border-color: #aaa;
    color: var(--c-text);
}

.mt-filter-row button:focus-visible {
    outline: 2px solid var(--c-accent);
    outline-offset: 2px;
}

.mt-filter-row button.active {
    background: var(--c-pill-active);
    border-color: var(--c-pill-active);
    color: var(--c-pill-text);
}

/* flag inside pill */
.mt-flag-emoji {
    font-size: 13px;
    line-height: 1;
    display: inline-block;
}

.mt-flag {
    width: 16px;
    height: 12px;
    display: inline-block;
    vertical-align: middle;
    border-radius: 2px;
    flex-shrink: 0;
    border: 1px solid rgba(0,0,0,0.09);
    box-sizing: border-box;
}

/* active pill — invert flag border */
.mt-filter-row button.active .mt-flag {
    border-color: rgba(255,255,255,0.25);
}

/* ── Post list ──────────────────────────────────────────────── */

#posts-container {
    display: flex;
    flex-direction: column;
}

.mt-post {
    display: grid;
    grid-template-columns: 80px 1fr 68px;
    column-gap: 18px;
    padding: 16px 0;
    border-bottom: 1px solid var(--c-border);
    align-items: start;
    transition: background 0.1s;
}

.mt-post:first-child {
    border-top: 1px solid var(--c-border);
}

/* date column */
.mt-post-date {
    font-family: var(--f-mono);
    font-size: 10px;
    color: var(--c-subtle);
    line-height: 1.5;
    padding-top: 3px;
    white-space: nowrap;
    letter-spacing: 0.01em;
}

/* body column */
.mt-post-body {
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.mt-post-title {
    font-size: 13.5px;
    font-weight: 600;
    line-height: 1.45;
    margin: 0;
    letter-spacing: -0.015em;
}

.mt-post-title a {
    color: var(--c-text);
    text-decoration: none;
    transition: color 0.1s;
}

.mt-post-title a:hover {
    color: var(--c-accent);
}

.mt-post-excerpt {
    font-size: 12px;
    line-height: 1.65;
    color: var(--c-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.mt-post-excerpt p {
    margin: 0;
}

.mt-post-author {
    font-family: var(--f-mono);
    font-size: 10px;
    color: var(--c-subtle);
    display: block;
}

/* thumbnail column */
.mt-post-thumb {
    display: block;
    width: 68px;
    height: 68px;
    border-radius: var(--r-img);
    overflow: hidden;
    flex-shrink: 0;
    background: var(--c-surface);
}

.mt-post-thumb--empty {
    visibility: hidden;
}

.mt-post-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: opacity 0.15s ease;
}

.mt-post:hover .mt-post-thumb img {
    opacity: 0.82;
}

/* ── Loading / empty states ─────────────────────────────────── */

.mt-loading,
.mt-no-posts {
    font-family: var(--f-mono);
    font-size: 11.5px;
    color: var(--c-subtle);
    padding: 44px 0;
    margin: 0;
    display: block;
}

/* ── Responsive ─────────────────────────────────────────────── */

@media (max-width: 600px) {
    .mt-post {
        grid-template-columns: 1fr auto;
        grid-template-rows: auto auto;
        column-gap: 12px;
    }

    .mt-post-date {
        grid-column: 1;
        grid-row: 1;
        padding-top: 0;
    }

    .mt-post-body {
        grid-column: 1;
        grid-row: 2;
    }

    .mt-post-thumb {
        grid-column: 2;
        grid-row: 1 / 3;
        width: 56px;
        height: 56px;
    }

    .mt-filter-label {
        width: 100%;
        margin-bottom: 2px;
    }
}